This might explain why the high-protein consuming body builders we see at Fitness and Health Expos who ingest lots of protein look 10 years older than they are! “Keep in mind that monitoring your protein intake is just as important as cutting non-vegetable carbs. If you eat more protein than what your body needs, you will prevent the activation of pathways associated with stem cell and immune system regeneration. This includes the mTOR, PKA, and IGF pathways.”
http://fitness.mercola.com/sites/fitness/archive/2016/03/25/health-benefits-fasting.aspx
Toms Blog on Life and Livingness